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The surrounding air influence on the thermal transient measurement was studied. The measurements were carried out by setting two boundary conditions where one was measured in open air condition and another transient was captured under still air environment. The data obtained were analysed using structure function evaluation. Analysis of the experimental methods reveal that the thermal resistance of the high power LED is much lower in still air condition compared to open air condition. For the same driving current of 600mA, the total thermal resistance for open air was 8.07692K/W whereas as for still air condition the value was much lower, 7.26577K/W.